Toothbrush base



FIG. 1 is a top, front, and left side perspective of a toothbrush base embodying my new design.

FIG. 2 is a bottom, rear, and left side perspective thereof.

FIG. 3 is a front elevation view thereof.

FIG. 4 is a rear elevation view thereof.

FIG. 5 is a left side elevation view thereof.

FIG. 6 is a right side view thereof.

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken-line showing of feet illustrates portions of the toothbrush base that form no part of the claimed design. 

The ornamental design for a toothbrush base, as shown and described. 